org.apache.hadoop.util.TestApplicationClassLoader.java Source code

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Here is the source code for org.apache.hadoop.util.TestApplicationClassLoader.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hadoop.util;

import static org.apache.hadoop.util.ApplicationClassLoader.constructUrlsFromClasspath;
import static org.apache.hadoop.util.ApplicationClassLoader.isSystemClass;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.List;
import java.util.jar.JarOutputStream;
import java.util.zip.ZipEntry;

import org.apache.commons.io.IOUtils;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.test.GenericTestUtils;
import org.junit.Before;
import org.junit.Test;

import com.google.common.base.Splitter;
import com.google.common.collect.Lists;

public class TestApplicationClassLoader {

    private static File testDir = GenericTestUtils.getTestDir("appclassloader");

    @Before
    public void setUp() {
        FileUtil.fullyDelete(testDir);
        testDir.mkdirs();
    }

    @Test
    public void testConstructUrlsFromClasspath() throws Exception {
        File file = new File(testDir, "file");
        assertTrue("Create file", file.createNewFile());

        File dir = new File(testDir, "dir");
        assertTrue("Make dir", dir.mkdir());

        File jarsDir = new File(testDir, "jarsdir");
        assertTrue("Make jarsDir", jarsDir.mkdir());
        File nonJarFile = new File(jarsDir, "nonjar");
        assertTrue("Create non-jar file", nonJarFile.createNewFile());
        File jarFile = new File(jarsDir, "a.jar");
        assertTrue("Create jar file", jarFile.createNewFile());

        File nofile = new File(testDir, "nofile");
        // don't create nofile

        StringBuilder cp = new StringBuilder();
        cp.append(file.getAbsolutePath()).append(File.pathSeparator).append(dir.getAbsolutePath())
                .append(File.pathSeparator).append(jarsDir.getAbsolutePath() + "/*").append(File.pathSeparator)
                .append(nofile.getAbsolutePath()).append(File.pathSeparator).append(nofile.getAbsolutePath() + "/*")
                .append(File.pathSeparator);

        URL[] urls = constructUrlsFromClasspath(cp.toString());

        assertEquals(3, urls.length);
        assertEquals(file.toURI().toURL(), urls[0]);
        assertEquals(dir.toURI().toURL(), urls[1]);
        assertEquals(jarFile.toURI().toURL(), urls[2]);
        // nofile should be ignored
    }

    @Test
    public void testIsSystemClass() {
        testIsSystemClassInternal("");
    }

    @Test
    public void testIsSystemNestedClass() {
        testIsSystemClassInternal("$Klass");
    }

    private void testIsSystemClassInternal(String nestedClass) {
        assertFalse(isSystemClass("org.example.Foo" + nestedClass, null));
        assertTrue(isSystemClass("org.example.Foo" + nestedClass, classes("org.example.Foo")));
        assertTrue(isSystemClass("/org.example.Foo" + nestedClass, classes("org.example.Foo")));
        assertTrue(isSystemClass("org.example.Foo" + nestedClass, classes("org.example.")));
        assertTrue(isSystemClass("net.example.Foo" + nestedClass, classes("org.example.,net.example.")));
        assertFalse(isSystemClass("org.example.Foo" + nestedClass, classes("-org.example.Foo,org.example.")));
        assertTrue(isSystemClass("org.example.Bar" + nestedClass, classes("-org.example.Foo.,org.example.")));
        assertFalse(isSystemClass("org.example.Foo" + nestedClass, classes("org.example.,-org.example.Foo")));
        assertFalse(isSystemClass("org.example.Foo" + nestedClass, classes("org.example.Foo,-org.example.Foo")));
    }

    private List<String> classes(String classes) {
        return Lists.newArrayList(Splitter.on(',').split(classes));
    }

    @Test
    public void testGetResource() throws IOException {
        URL testJar = makeTestJar().toURI().toURL();

        ClassLoader currentClassLoader = getClass().getClassLoader();
        ClassLoader appClassloader = new ApplicationClassLoader(new URL[] { testJar }, currentClassLoader, null);

        assertNull("Resource should be null for current classloader",
                currentClassLoader.getResourceAsStream("resource.txt"));

        InputStream in = appClassloader.getResourceAsStream("resource.txt");
        assertNotNull("Resource should not be null for app classloader", in);
        assertEquals("hello", IOUtils.toString(in));
    }

    private File makeTestJar() throws IOException {
        File jarFile = new File(testDir, "test.jar");
        JarOutputStream out = new JarOutputStream(new FileOutputStream(jarFile));
        ZipEntry entry = new ZipEntry("resource.txt");
        out.putNextEntry(entry);
        out.write("hello".getBytes());
        out.closeEntry();
        out.close();
        return jarFile;
    }

}